This is just en eerie reminder of the same sort of dismissals against Steve Jobs: just a sales guy. Just good PR. Unfortunately for you this cheapo trick doesn't work with Elon Musk as it is very well known and documented how razor sharp he is when it comes to science and technology. He did most of the programming himself for his internet startup. He learned rocket science from the ground up without going to uni to get a degree. He impresses people with decades in the rocket industry with his insights and understanding of the subject. Elon Musk understand the technical details of his products exceptionally well. He knows the inside out of the Falcon 9 rocket. This isn't just some sales guy.